From 5ecd0fc61a1a292426538fcb1e791342e04953b5 Mon Sep 17 00:00:00 2001 From: Thomas Voss Date: Wed, 6 Mar 2024 16:41:59 +0100 Subject: Genesis --- lib/alloc/bufalloc.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 lib/alloc/bufalloc.c (limited to 'lib/alloc/bufalloc.c') diff --git a/lib/alloc/bufalloc.c b/lib/alloc/bufalloc.c new file mode 100644 index 0000000..a81f5b9 --- /dev/null +++ b/lib/alloc/bufalloc.c @@ -0,0 +1,29 @@ +#include +#if __has_include() +# include +# warning "stdckdint.h now available; remove manual ckd_*() implementations" +#elifdef __GNUC__ +# define ckd_add(r, a, b) ((bool)__builtin_add_overflow(a, b, r)) +# define ckd_mul(r, a, b) ((bool)__builtin_mul_overflow(a, b, r)) +#else +# define ckd_add(r, a, b) (*(r) = (a) + (b)) +# define ckd_mul(r, a, b) (*(r) = (a) * (b)) +# warning "ckd_*() not supported on the current platform" +#endif +#include + +#include "alloc.h" +#include "errors.h" + +void * +bufalloc(void *p, size_t n, size_t m) +{ + if (ckd_mul(&n, n, m)) { + errno = EOVERFLOW; + err(__func__); + } + + if (!(p = realloc(p, n))) + err(__func__); + return p; +} -- cgit v1.2.3